GFZ prototype for GPS-based realtime deformation monitoring

Transcription

1 GFZ prototype for GPS-based realtime deformation monitoring Junping Chen, Maorong Ge, Markus Vennebusch, Gerd Gendt, Markus Rothacher Department of Geodesy and Remote Sensing, GeoForschungsZentrum, Postdam Contact: EGU 2008,Session G7 Vienna, Austria April, 2008 EGU 2008,Session G7,17 April,2008 1

2 Background G-SEIS (GPS - SurfacE Deformations within Seconds ) Prototype software Program structure Satellite clock estimation PPP solution for single station Network solution Real-time investigation and implementation Orbit influence Network influence Tropospheric parameter Real-time implementation Conclusions Content EGU 2008,Session G7,17 April,2008 2

3 G-SEIS G-SEIS: GPS - SurfacE Deformations within Seconds 1.Design and development of new series of multi-parameter stations 2.Development of new and automated real-time GPS/GNSS software providing satellite orbits and clocks in real-time kinematic monitoring of station positions in real-time PPP and Network mode Special studies high-rate GNSS data GNSS combined solutions comprising GPS, GLONASS and the upcoming GALILEO system EGU 2008,Session G7,17 April,2008 3

4 Structure of GFZ prototype software TCP Connection Simulated streams BNC Rinex file streaming GNSS OBS SAT. CLOCK PreProc ORBIT ERP Others Products Service Network Solution PPP AMBFIX GNSS User Sites Sat. Orbit Sat. Clock EGU 2008,Session G7,17 April,2008 4

5 Mw 7.7 earthquake (Chile, 14-15,11,2007. Doy 318,2007.) TALA (100 km away from epicenter) Simulated real-time processing Rinex file streaming Deformation monitoring Picture From U.S.Geological Survey web (USGS) EGU 2008,Session G7,17 April,2008 5

6 Satellite clock estimation Selected network (GFZ IGR network), Doy 318,2007, sampling:30 sec EGU 2008,Session G7,17 April,2008 6

7 Satellite clock estimation Clock estimation (compare estimated clock to IGS AC s clock) IGS GFZ CODE(30s) Average Stdev. (ns) EGU 2008,Session G7,17 April,2008 7

8 Deformation monitoring (PPP) Mw 7.7 earthquake (Chile, 14-15,11,2007 ) Kinematic coordinate (TALA: difference from daily solution) Earthquake epoch EGU 2008,Session G7,17 April,2008 8

9 Network mode solution Network: RAMSAC(Argentine network for continuously satellite monitoring) Nearby IGS stations Kinematic station near Earthquake Epicenter EGU 2008,Session G7,17 April,2008 9

10 Network mode solution Kinematic coordinate (TALA, difference from daily solution) Earthquake epoch EGU 2008,Session G7,17 April,

11 Orbit influence(1/2) Clock estimation using different orbit (Estimated clock vs. IGS final clock) 6 hour: 12 RMS=0.12ns hour:rms=0.14ns Prediction EGU 2008,Session G7,17 April,

12 Orbit influence(2/2) Kinematic coordinate difference of TALA using sat. clock estimated from IGS Final orbit and IGU_12 orbit) EGU 2008,Session G7,17 April,

13 Network influence(1/2) Selected network (similar with IGS real-time network) EGU 2008,Session G7,17 April,

14 Network influence(1/2) Clock estimation from different network (based on IGU_00 orbit) EGU 2008,Session G7,17 April,

15 Network influence(2/2) Kinematic coordinate of TALA (sat. clock from global and real-time network) GFZ-IGR network Real-time-like network EGU 2008,Session G7,17 April,

16 Troposphere parameter Ztd (estimation vs. GFZ final solution) Bias:0.4cm, RMS:1.2cm EGU 2008,Session G7,17 April,

17 Troposphere parameter Correlation between Trop. and station height Coef.= -0.6 Height correction 0.18 Troposphere correction(mirror) 0 Height correction(m) Troposphere correction(m) Epoch EGU 2008,Session G7,17 April,

18 Real-time implementation Network: Real-time GNSS Data Stream in Europe (picture from BKG web) 30 stations were used, sampling:1 second orbit: IGU, a-priori clock: Broadcast EGU 2008,Session G7,17 April,

19 Real-time implementation Kinematic coordinate from network solution (DUBR, Croatia) EGU 2008,Session G7,17 April,

20 Conclusions Performance of prototype software Satellite clock estimation accuracy : ~0.1ns Kinematic coordinate accuracy: Horizontal 2~4 cm, Height<10cm Surface deformation (cm level) can be detected during earthquake Real-time investigation Orbit update: < 6 hour. Real-time Network: In Africa and Asia, stations should be installed Real-time implementation European network monitoring. Further Works Filter Initialization Ambiguity-Fixing in PPP Troposphere Delay Modeling EGU 2008,Session G7,17 April,

21 Acknowledgement Dr. Juan Carlos Báez Soto from Universidad de Concepción (Chile) is acknowledged for providing raw data of TALA. Bundesamt für Kartographie und Geodaesie (BKG) is acknowledged for providing European real-time data stream. EGU 2008,Session G7,17 April,

22 Thank you! EGU 2008,Session G7,17 April,